Goedert, Wenceslau J., and Marvin T. Beatty. 2014. “Characterization of Grumusols in Southwestern Rio Grande Do Sul III. Morphology and Classification”. Pesquisa Agropecuaria Brasileira 6 (1): 243-51. https://doi.org/10.1590/S1678-3921.pab1971.v6.17704.